When your car modification involves creating a special sliding roof so that the exhaust from your rear-mounted jet engine can burp fire, you reached the carbuilder's Valhalla. Meet the Mini Jet, a 650-hp, dual-engined rocket.

Constructed by BMP Design of Tyler, Texas, the Mini Jet mixes a tuned Mini Cooper S with a Rolls Royce-Allison 250-C20B turbine engine behind the front seats, adding 420 hp and 400 ft-lb. of torque driving the rear wheels. The roof modification — an electric shutter and fan — was necessary to port the exhaust from the turbine while protecting it from rain, the only Kryptonite that could kill this Supermini.

As the video below shows, each engine requires a separate fuel tank, so the throttle for the jet engine is a stick on the side of the driver's seat, just as it was in the helicopter where the turbine came from.